I'm not so sure Jackman as Wolverine sells itself. I mean Origins didn't make a mint... And I think a lot of people see this as dragging it out a bit.

Origins still made a significant profit... especially considering the leaked blue-print and the fact that it was already treading water covering the origin story again.

As for Man of Steel... I'm now slightly worried that WB are approaching this like they did with The Dark Knight Rises. Fair enough to do that with Batman, but they NEED to be more upfront with Superman. This movies success is still very much 50/50...

What the harm in releasing some stills and character posters?

They need to start emphasising the ACTION in the promotional trailers. No more of Superman looking regal and thoughtful.